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我用一个500W,24V开关电源做供电，用LM5145把正24V转换成负24V，输出电流小于800mA时输出负24V电压正常，输出电流大于800mA后输出电压急速下降，电流2A时，输出电压下降到了负12V, 请问下，是哪里出了问题，电路图如下：
